Analysis and Optimization of the Electromagnetic Performance of a Novel Stator Modular Ring Drive Thruster Motor

Yukai Li,Wenlong Tian,Zhaoyong Mao,Baowei Song

doi:10.3390/en11061598

Abstract

A rim driven thruster (RDT) is an integrated deep-sea motor thruster that has been widely studied. In order to improve the performance of RDT, a novel RDT motor with a modular stator is proposed in this paper. The electromagnetic performance of the new RDT motor is analyzed by the finite element method (FEM). The influence of structure parameters on the electromagnetic performance of the new RDT motor are analyzed in detail. It is shown that the effect of additional tooth width and pole arc coefficient on the electromagnetic performance of the stator modular RDT motor is significant. To obtain the optimal design with a maximum average electromagnetic torque and minimum torque fluctuation ratio, a multi-objective optimization design method combining the non-dominated sorting genetic algorithm II (NSGA-II), Kriging method and FEM is presented in this paper. A set of Pareto optimal solutions is obtained, and the optimal design point is selected from the Pareto fronts. Compared with the initial design, the average electromagnetic torque of the optimized model is improved by 16.591% and the fluctuation ratio is reduced to 3.18%.

Highlights

The ocean area accounts for over two-thirds of the earth’s surface, most of which are deep sea areas that still remain to be explored
This paper focuses on the influence of the four design parameters on the electromagnetic performance of the rim driven thruster (RDT) motor, and neglects the manufacturing tolerances
RDT, a stator modular motormotor is proposed in thisin paper

Summary

Introduction

The ocean area accounts for over two-thirds of the earth’s surface, most of which are deep sea areas that still remain to be explored. With the rapid development of marine technology, interest in deep sea exploration is increasing both in the scientific and business communities [1]. Motor thruster is one of the core components of deep-sea exploration equipment, and affects their overall performance directly. The deep-sea environment is characterized by the total absence of sunlight and high hydrostatic pressure [2]. The requirements for the motor thruster are as follows: (1) (2) (3) (4). High pressure resistance: The deep-sea motor thruster must be able to work under deep sea water pressure. Corrosion resistance: The part of the motor thruster that is in direct contact with seawater must have seawater corrosion resistance

Methods

Results

Conclusion